Let veca,vecb,vecc be unit vectors such ...

Let `veca,vecb,vecc` be unit vectors such that `veca+vecb+vecc=vec0`. Which of the following is correct?

`atimesb=btimesc=ctimesa=0`

`atimesb=btimesc=ctimesane0`

`atimesb=btimesc=atimesc=0`

`atimesb, btimesc, ctimesa` are mutually perpendicular

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